Colossal negative thermal expansion in reduced layered ruthenate.

ABSTRACT: Large negative thermal expansion (NTE) has been discovered during the last decade in materials of various kinds, particularly materials associated with a magnetic, ferroelectric or charge-transfer phase transition. Such NTE materials have attracted considerable attention for use as thermal-expansion compensators. Here, we report the discovery of giant NTE for reduced layered ruthenate. The total volume change related to NTE reaches 6.7% in dilatometry, a value twice as large as the largest volume change reported to date. We observed a giant negative coefficient of linear thermal expansion α=-115 × 10^-6 K^-1 over 200 K interval below 345 K. This dilatometric NTE is too large to be attributable to the crystallographic unit-cell volume variation with temperature. The high

SUBMITTER: Takenaka K 

PROVIDER: S-EPMC5234094 | biostudies-literature | 2017 Jan

REPOSITORIES: biostudies-literature